Daily Challenges
By Mike Burn

Minesweeper First Click: Why You Never Hit a Mine

Every Minesweeper player has wondered: is the first click always safe? In modern Minesweeper versions, yes. But how this works — and how much it varies between versions — is more interesting than you might think.

See for yourself: Play Minesweeper Blast — click any cell and you will always get a safe opening on your first click.

First-Click Safety: How It Works

When you click your first cell, most modern Minesweeper implementations do one of these:

Method 1: Generate After Click (Most Common)

  1. You click a cell
  2. Then the board generates mines — avoiding your clicked cell
  3. Your cell is guaranteed safe

This is how Windows Minesweeper (Vista and later) and most online versions work, including Minesweeper Blast.

Method 2: Move the Mine

  1. Board is pre-generated with mines placed
  2. You click a cell
  3. If that cell has a mine, the mine moves to another random empty cell
  4. Your cell becomes safe

This is how the original Windows 3.1 Minesweeper worked.

Method 3: No Safety (Rare)

  1. Board is pre-generated
  2. You click
  3. If you hit a mine, you lose

This is how some very old or minimal implementations work. It is rare in modern versions.

First-Click Safety Levels

Different versions offer different levels of first-click safety:

Safety Level What It Does Example
Cell safe First-clicked cell will not be a mine Windows 3.1 Minesweeper
Cell is zero First-clicked cell guaranteed to be 0 (blank), producing a cascade Windows Vista+, Minesweeper Blast
Neighborhood safe First-clicked cell and all 8 neighbors are mine-free Some custom implementations
Full opening First click always produces a large cascade No-guess generators with opening guarantee

Cell is zero is the most common modern standard. It means your first click always produces a cascade that opens multiple cells, giving you information to start solving.

How board generation works →

Why Corners Give the Best First Click

If first-click safety guarantees a cascade, where should you click?

Corners. Here is why:

A corner cell has 3 neighbors. For the first click to produce a cascade, those 3 neighbors must also be zeros (blanks). With fewer neighbors, the probability that all of them are mine-free is higher.

Click Position Neighbors Probability of Blank (Beginner) Average Opening Size
Corner 3 ~50% Largest
Edge 5 ~38% Medium
Interior 8 ~28% Smallest

Probabilities are approximate for Beginner difficulty (12.3% mine density). On Expert (20.6% mine density), the difference is even more pronounced.

Full opening strategy guide →

What Happens After the First Click

After your safe first click opens a cascade:

  1. Scan the boundary — the edge where revealed numbers meet unrevealed cells
  2. Look for solvable cells — any number whose mines are fully determined
  3. Apply patterns — 1-1-X, 1-2-X, and other common patterns
  4. Chord where possible — use chording to clear safe cells quickly

The cascade gives you your starting information. Everything after that is logical deduction.

First Click in No-Guess Minesweeper

No-guess Minesweeper adds an important guarantee beyond first-click safety: every cell on the board can be deduced logically from the information available.

This means:

  • First click produces an opening (same as standard first-click safety)
  • From that opening, you can always find at least one safe cell to reveal
  • The chain of deductions continues until the board is solved
  • You never need to guess

On Minesweeper Blast, boards are no-guess — so your first click starts a chain of deductions that can solve the entire board without any luck.

Historical Note: Windows 3.1

The original Microsoft Minesweeper (Windows 3.1, 1990) used Method 2: mines were placed first, and if your first click hit one, it was silently moved. This had an interesting side effect:

  • The mine moved to a random cell
  • This could change the board’s solvability
  • You might end up with a board that requires guessing even if the original layout was solvable

Windows Vista (2007) switched to Method 1 (generate after click), which produces cleaner boards and better gameplay.

Full Minesweeper history →

Speed Implications

For speedrunners, the first click matters:

  • Click a corner before the timer starts (or as the timer starts — depends on the version)
  • Large opening = faster start because you have more boundary to work with
  • Small opening = restart? Many competitive players immediately restart if the opening is too small
  • Strategic players may start solving even from small openings to maximize consistency

The tradeoff: restarting can save time on a fast run, but wastes time overall. Most players set a threshold — for Expert, restart if fewer than ~30 cells open.

Speed guide → | Benchmarks →